All horses’ aerobic capacity and maximum speed rose at the conclusion of the trial, while maximum heart rate fell in all groups. Indeed, training (of any kind) enables horses to develop and evolve their physical abilities.However, there was a clear difference in the evolution of the last group, which trained under saddle and on a treadmill for eight months. The horses in this group developed greater metabolic power, aerobic capacity and oxygen carrier concentration in their body (red cells, hemoglobins).